Blocking oscillator



f1e lowef section lo of the doo tfiode tube T iS ort of a b1ockingosci11ator coInpfising elen1ents zo, 3o, 4o, 5o and so which ooffeSpond to the sin1nar elements of ig. 1. In th1s instance, however, the tfiode lo haS signa1 iInpulSes sup plied to ftS plate of anode ffon1 the uppef tfiode Section 8 of the tube T, the latter tfiode seotion having iInpulses Supp1ied to itS grid ffom Soufce e. By viftue of the action of the fesonant oirouit 5o the ffequency of the SignaJ1 inlpulSes Supplied to the blooking-osoillatof iS divided, e. g. by seven, as deSofibed above vvith Tefefenoe to Fig. 1.

The signa1 aofoss feSiStof Bo fS soppned to a Second ffequenoy dividef stage inoluding the tube lo, tfansfoTn1er 2o, resistor 3o, oondenSef 4o, feS onant cifouit 5b, and output TeSiStor ob. This second Stage effeots al fofthef ffequenoy division, e. g, by Seven. In an expefinlentall eInbodiInent of the tWoStage cifouit a signal ffequenoy of 29o oycles WaS feduoed to 60 oyo1es, thefe being a ffequenoy division by Seven in each stage.

Although the invention halS been desofibed With TefeTence to the illustrated en1bodiInentS, it Wi11 be understood that it fs not thuS 1iInited but fS capable of various n1odioations Within the soope of the appended olaifns.

clain1:

1. 1f1 an electfica1 sySteIn eInploying tfn1e spaced pu1Se signalS= a blooking tube oso111atof ooInpfising a vacuoIn tllbe having at least a cath ode, a. grid and an anode, transfornler Ineans fof regenefatively collpling the grfdoathode and anodeoathode cifouitS of s9did t11be, o gfid-lealk gridcondenSer cofnbination connected in the gfid-oathode oifouit of said tube, Said blooking tuhe osoillatof being actllated by desired pl11seS but being Subject to ootuation by undesireo po1Ses; nleanS enefgized by said blocking tube osoiHatof fof producing a Sif111Soidal vo1tage vvave having a pfedetefInined ffequenoy relation to the ffequenoy of oooufrence of Said desiTed pu1Ses; and Ineans for llti11zing Sald voltage vvaJve to deoTeaSe the feSponSivenesS of SaJid osoillatof to the ondesifed p111ses.

2. In an electfica1 sySten1 employif1g time- Spaced pulSe signalS: a blocking tube oSoillator ooInpfising a vac1111In tube having at least a oathode, a gfid and an anode, transforIner fneanS for fegeneratively coupling the gfidoathode and anodecathode cifouitS of Said tube, gfid-1eak gfid condenser coInbination oonnected in the gTidcathode cifcuft of said t11be, Said blocking tube oscillator being act11ated by desired pulses but being subject to actuation by ondesifed pulses; a fesonant oiro11if enefgized by pulseS of ooffent developed by said blocking tube osofllatof to produce o sinusoidal voltage wave having a predetern1ined ffeq11efloy felation to the frequenoy of ocooffenoe of Said deSifed pulses; and

IneanS fo1' 11tilizing Said voltage wave to deofease the TesponSivenesS of said osciHtof to the unde Sired pulSes.

3. In an electrical syStem eInploying ti1ne Spaced pulSe Signals: a b]ocking tllbe oscillatof oofnpfising a vaouuIn tube having at least a cathode, a gfld and an anode, transforn1er n1eans fof regenefatively col1p1ing the gf1d-oathode and anodecathode ciro11itS of said tube, a gfid-leak grid-condensef con1bination connected in the gfidoathode oifouit of Said tube, Safd blocking tube oSo111atof being fesponSive to pu1SeS exoeed ing a predetern1ined afnplitude leve1; fneanS enef gized by said blooking tube osoi11atof for pfoduc ing a Sinusoida1 voltage wave at leaSt sofne of whose peaks ocour in subStant1al ooinoidence with the desifed pulSes; and n1eanS fof cofnbining sald voltage wove with said pulSe signals thefeby to faise the deSired pulSeS above Soid an1plitude level and to lower the undesifed pulses beloW Sald ampntode level.

4=. In an eleotfioa1 sySten1 efnployfng tine spaced p111Se SignalS= a blooki11g tube oSc11latof cofnpf1Sing a vaoouTn tobe having at least a oothode, a gfid and an anode, transfoffnef Ineans foI' regenefatively ooup1ing the grid-cathode and anode-cathode oifouitS of Said tube, a grid-leak gfidoondenSef oon1binotion oonnected in the gfid-c9fthode oirouit of Said t11be, Said blocking tube osoillator being actuated by deSifed pu1Ses but being Subjeot to actuation by ondesired p111Ses; gnd a resonant oircuit conneoted in the grid-cathode cirouft of salid tube fof pfodooing a Siflusoidal voltage wave having a predeterfnined frequency relation to the frequency of ocourrenoe of Said deSifed pulses So as to deofeaSe the responsiveneSs of Said osci11atof to the undesifed pulses.

AxANDB B. APPGABT, JR.

BEFEBENoES oITED The fo11ovving references are of fecofd fn the 1e of hiS patent:

N 11111be1, Nan1e Dte 1,999,378 Tolson Apf. 30, 1935 2,11,33 Can1pbe11 Deo. 27, 1938 2,235,131 vvheeler 1`/faf. 18, 191 2,255 o3 vvheelef sept. 9, 1941 2 27v,0oo Bingley Maf. 17, 192 2,288,55 SInith, Jr. June 30, 1942 2,16,24 wi1son eb. 25, 194L7 

